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The answer is it depends. You can have it unplugged, but if you put devices in that exceed the power provided via the computer's USB connection (i.e., the USB connection from your laptop or other computer to the hub), then the device will not work. I believe the maximum power available without AC is 500mA.
Sorry, there was a problem. Please try again later.No, I use mine without power cable and works fine since I only plug in a mouse or hardware that doesn't require a lot of juice.
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